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H. M. DARLING.

LATHE CHUCK.

No. 96,207. Patented Oct. 26, 1869.

dished istrs fistrt one.

H. M. DARLING, OF BRIDGEPORT, CONNECTICUT,

Letters Patent N 0. 96,207, dated October 26, 1869.

rmrnovs'o LATHE-CHUCK.

w The schedule referred to in these Letters Patent and making put of the name.

To all whom it may concern: (1, as seen in fig. 5, to receive each a screw,- B, as also Be itknown that I, H. M. DARLING, of Bridgeport, seen in fig. 5, arranged so that by the turning of the in the county of Fairiield, and State of Connecticut, said screws, the jaws will be moved toward or from have invented a new Improvement in Lathe-Chucks; the centre, accordingly as the screws are turned. and I do hereby declare the following, when taken in The head I; of each screw is toothed, as seen in figs. connection with the accompanying drawings, and the 4. and 5, and over thebody of the chuck a ring, 0, is letters of reference marked thereon, to be a full and passed, having upon its inner surface a screw-thread, exact description of the same, and which said drawas denoted in figs. 5' and 6.

ings constitute part of this specification, and represent This ring rests against a shoulder, f, at its rear, and inon the front a plate, D, is fixed to prevent the ring Figure 1, a perspective view. moving longitudinally on the chuck, as seen in fig. 6.

Figure 2, a front end view. As the screws are set parallel to the radial line in Figure 3, a front end view with the cap removed. which the jaws move, it follows that the head projects Figure 4, a side view, the screw-ring and plate reabove the surface of the body of the chuck only at moved. one point, as seen in fig. 5, hence, the internal thread Figure 5, a section on line a: z. of the ring 0 only operates at that point; therefore, by

Figure 6, a section on line y y. turning the said ring, which has no-latcral move- This invention relates to an improvement in the ment, the screw-thread on the ring will, at each full instrument employed in lat-hes for holding drills, and revolution, turn all the screws one tooth of the head, commonly called lathe-chucks, and my improvement therefore, by continual revolution oflthe ring, thejaws is in that class which carries three radial jaws, all si will be moved toward orfrom the centre, according to mnltaneously toward or from a common centre; and the direct-ion in which the ring revolves.

The invention consists in the arrangement in each Having therefore thus fully describedmy invention, of the jaws, of a screw parallel to the radial line of What I claim as new and useful, and desire to sethe respective jaws, the head of the screw toothed, so cure by Letters Patent, isas to beworked by the internaltbread of a ring set In combination with the radial jaws a, their respecover the chuck, and so that by the turning of the tive screws B, with toothed heads b, arranged relasaid ring, the screw will be revolved, and move the tively to the jaw, and the intemally threaded ring 0, jaws towardor from the centre, as the case may be: operating in the teeth of the screw-head so as to move To enable others skilled in the art to use and conthe jaws, substantially in the manner as herein set struct my invention, I will proceed to describe the forth. same, as illustrated in the accompanying drawings. '11. M. DARLING.

A is the body of the chuck, within which are fitted three radial jaws, a a a, as seen in figs. 3 and 5, each oi the said jaws provided upon each side' with a lug,

Witnesses:

Joan E. Esau-n,

Joan E. Smmwmz. 

